Tritanopia is a form of color blindness in which the retina is deficient in or lacks cone cells containing opsins that respond to the color blue, resulting in an inability to distinguish blue from green.
There are several variations of vision deficiency, such as Deuteranomalia (which makes everything look a little faded), Protanopia (which makes everything seem a little green), and as I said, Tritanopia (greenish-pink tones). Only around 0.00003% of the world’s population suffers from total color blindness (Monochromacy).